https://bugs.documentfoundation.org/show_bug.cgi?id=113383
Bug ID: 113383
Summary: [Calc] Transparency in charts garbles PRINT PREVIEW.
Product: LibreOffice
Version: 5.4.2.2 release
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: medium
Component: Calc
Assignee: libreoffice-bugs at lists.freedesktop.org
Reporter: kurt.pfeifle at gmail.com
Created attachment 137240
--> https://bugs.documentfoundation.org/attachment.cgi?id=137240&action=edit
Hybrid PDF embedding original ODS document (which exhibits the described bug)
This bug has already been reported as #99859, but I've been asked to open a new
one.
Attached is an LO-generated "Hybrid" PDF which has the original ODS document
embedded.
-----------
If you (like some bug handlers in the other bug previously) don't know
how to extract the ODS from the Hybrid PDF, here's how:
1. Open Hybrid PDF with LibreOffice.
2. Save it again -- but please use "Save As..."
-----------
Now you should have both files:
- The original ODS.
- A PDF which has the original ODS embedded. This can be opened by any
standard PDF viewer. But it also can be opened by LibreOffice by silently
extracting the ODS (while still pretending to the user to edit the PDF).
The ODS exhibits several problems with LibreOffice's handling of
transparencies, when comparing three different views:
1. View of exported PDF (which is the same as a printout on paper would look).
2. Normal document view.
3. Print preview.
(Ignore the font color mismatch, which is in the big headline of the 1st
sheet (font color is defined as yellow, but document view displays it as
black) -- this part of the problem seems now to be tracked via bug
#99859.)
However, look the second and third charts in all three views mentioned above.
You'll see several artefacts in the print preview, while the PDF export looks
perfectly good.
If you investigate the document in detail, you'll find that (some) embedded
charts use transparency value of 35% for the trend lines. Setting that
transparency to 0% removes the weird artefacts from the preview.
Scope of this bug:
# Users looking at the print preview only may never try to actually export to
PDF
# or send the job to the printer, but instead fiddle hours and hours with
their
# document in order to "get it right". It can lead to a lot of time wastage
--
# even for people who know that the end result is good, they'll have to jump
# through hoops of repeatedly exporting to PDF first for a good fidelity
print
# preview, before they send the file to the printer.
I noticed this first with LO v5.1.2.2 on macOS.
It is still here with my current version:
Version: 5.4.2.2
Build ID: 22b09f6418e8c2d508a9eaf86b2399209b0990f4
CPU threads: 8;
OS: Mac OS X 10.12.6;
UI render: default;
Locale: de-DE (en_US.UTF-8);
Calc: group
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